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avi_to_lmdb.py
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avi_to_lmdb.py
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# -*- coding: utf-8 -*-
"""
Created on Wed Nov 9 10:40:36 2016
@authors: Danny Neil, iulialexandra
@contact: iulialexandralungu@gmail.com
Utility file used to transform a series of AVI files into an LMDB for
training in Caffe.
Uses categories {paper, rock, scissors, background} for classification.
"""
import os
import os.path
import imageio
import caffe
import lmdb
import os
import argparse
import time
import sys
import numpy as np
DB_KEY_FORMAT = "{:0>10d}"
def create_label_files(label_filenames, num_frames, working_dir, labels_dir):
"""Creates one .txt file for each AVI movie containing the class number
for each frame in the movie.
Parameters
----------
label_filenames: list of filenames, one for each AVI movie,
where the labels will be saved
num_frames: list of frame number in each AVI movie.
working_dir: working directory, where the labels files will be saved
"""
labels_dir = os.path.join(working_dir, labels_dir)
if not os.path.exists(labels_dir):
os.makedirs(labels_dir)
for idx, f in enumerate(label_filenames):
label = f.split("_")[0]
fout = open(os.path.join(labels_dir, f), "w+")
if (label.find("paper") == 0):
for frame in range(num_frames[idx]):
fout.write(" 0\n")
if (label.find("scissors") == 0):
for frame in range(num_frames[idx]):
fout.write(" 1\n")
if (label.find("rock") == 0):
for frame in range(num_frames[idx]):
fout.write(" 2\n")
if (label.find("background") == 0):
for frame in range(num_frames[idx]):
fout.write(" 3\n")
fout.close()
def create_workfile(dir_to_walk, working_dir, workfile, labels_dir):
"""Traverses a directory and its subdirectories and places all .avi files
it finds in a .txt file, along with the name of a label file corresponding
to each .avi.
Parameters
----------
dir_to_walk: directory to traverse in search for .avi files
working_dir: directory where the workfile will be saved
workfile: name of the workfile
labels_dir: directory where the labels files will be saved
"""
recordings = []
num_frames = []
label_filenames = []
for dirpath, dirnames, filenames in os.walk(dir_to_walk):
for filename in (f for f in filenames if f.endswith(".avi")):
avi_path = os.path.join(dirpath, filename)
recordings.append(avi_path)
label_filenames.append(filename.split('.')[0] + '_label.txt')
vid = imageio.get_reader(avi_path, 'ffmpeg')
num_frames.append(vid._meta['nframes'])
import math
if math.isinf(vid._meta['nframes']):
print("The following avi movie has too many frames: ",
label_filenames[-1])
sys.exit()
create_label_files(label_filenames, num_frames, working_dir, labels_dir)
fout = open(os.path.join(working_dir, workfile), "w+")
for idx, rec in enumerate(recordings):
fout.write(rec + ' ' + os.path.join(working_dir, labels_dir,
label_filenames[idx] + "\n"))
fout.close()
def avi_to_frame_list(avi_filename, gray):
"""Creates a list of frames starting from an AVI movie.
Inverts axes to have num_channels, height, width in this order.
Parameters
----------
avi_filename: name of the AVI movie
gray: if True, the resulting images are treated as grey images with only
one channel. If False, the images have three channels.
"""
print('Loading {}'.format(avi_filename))
vid = imageio.get_reader(avi_filename, 'ffmpeg')
if gray:
data = [np.mean(np.moveaxis(im, 2, 0), axis=0, keepdims=True)
for im in vid.iter_data()]
print('Loaded grayscale images.')
else:
data = [np.moveaxis(im, 2, 0) for im in vid.iter_data()]
print('Loaded RGB images.')
return data
def label_file_to_labels(label_filename):
"""Reads a file containing labels for one AVI movie and puts it in a list.
"""
with open(label_filename, 'r') as f:
all_labels = [int(label) for label in f.readlines()]
return all_labels
def read_data_from_LMDB(read_db, max_to_read=None):
"""Reads data from LMDB database and returns a list of entries in
non-human readable form. To convert them to string, use Caffe's tools
"""
data = []
with read_db.begin() as txn:
if max_to_read is None:
max_to_read = txn.stat()['entries']
cursor = txn.cursor()
it = cursor.iternext(keys=False, values=True)
for counter in range(max_to_read):
if counter % 100000 == 0:
print("Reading entry {}".format(counter))
data.append(it.item())
it.next()
read_db.close()
return data
def shuffle_LMDB(in_lmdb_name, LMDB_path):
"""Creates shuffled LMDB starting from a given LMDB.
"""
print("Shuffling database {}".format(in_lmdb_name))
in_lmdb = lmdb.open(os.path.join(LMDB_path, in_lmdb_name), readonly=True)
shuffled_db = lmdb.open(os.path.join(LMDB_path,
'shuffled_' + in_lmdb_name))
with in_lmdb.begin() as in_txn:
num_entries = in_txn.stat()['entries']
random_indices = np.arange(num_entries)
np.random.shuffle(random_indices)
with shuffled_db.begin(write=True) as shuffled_txn:
for i in range(num_entries):
if i % 100000 == 0:
print(i)
in_key = DB_KEY_FORMAT.format(random_indices[i])
in_dat = in_txn.get(in_key)
out_key = DB_KEY_FORMAT.format(i)
shuffled_txn.put(out_key, in_dat)
in_lmdb.close()
shuffled_db.close()
def write_data_to_lmdb(db, data_in, labels_in, curr_idx):
"""Given arrays of data and the labels, it writes the information in an
LMDB
Parameters
----------
db: LMDB to write the data into
data_in: image arrays
labels_in: list of labels
curr_idx: the idx used as key for writing in the LMDB
"""
with db.begin(write=True) as in_txn:
for i in range(len(data_in)):
d, l = data_in[i], labels_in[i]
im_dat = caffe.io.array_to_datum(d.astype('uint8'),
label=int(l))
key = DB_KEY_FORMAT.format(curr_idx)
in_txn.put(key, im_dat.SerializeToString())
curr_idx += 1
return curr_idx
def write_categ_lmdb(workfile, categories, LMDB_path, gray):
"""Given a workfile containing the AVI movies and the labels for each
frame, this function creates an LMDB for each classification category.
"""
# Open databases
categ_db = []
for idx, categ in enumerate(categories):
categ_db.append(
lmdb.open(os.path.join(LMDB_path, categ), map_size=int(1e12),
map_async=True, writemap=True, meminit=False))
curr_idx = np.zeros(len(categories), dtype='int')
with open(workfile, 'r') as f:
for line in f.readlines():
# Load work to do
avi_file, label_file = line.strip().split(' ')
# Convert to data
file_frames = avi_to_frame_list(avi_file, gray)
file_labels = label_file_to_labels(label_file)
# Quick check the lengths
assert len(file_frames) == len(file_labels), \
'Frames and Labels do not match in length!'
# Write data in each LMDB corresponding to the .avi category
db_label = avi_file.split("/")[-1].split("_")[0]
index = categories.index(db_label)
curr_idx[index] = write_data_to_lmdb(categ_db[index],
file_frames, file_labels,
curr_idx[index])
return curr_idx
def write_train_test_lmdb(categories, LMDB_path, train_test_split, num_rot):
"""Entire pipeline of train and test LMDB creation.
"""
DB_KEY_FORMAT = "{:0>10d}"
curr_idx = np.zeros(len(categories), dtype='int')
for c_idx, categ in enumerate(categories):
categ_db = lmdb.open(os.path.join(LMDB_path, categ), readonly=True)
with categ_db.begin() as txn:
curr_idx[c_idx] = txn.stat()['entries']
categ_db.close()
min_idx = min(curr_idx)
print("Number of images for each category: ", curr_idx)
train_idx = int(train_test_split * min_idx)
print("train samples ", train_idx)
test_idx = min_idx - train_idx
print("test samples ", test_idx)
indices_categ = np.arange(min_idx)
print(len(categories))
indices_train_database = np.arange(
len(categories) * train_idx * (num_rot + 1))
print("total training samples ", len(indices_train_database))
np.random.shuffle(indices_train_database)
indices_test_database = np.arange(
len(categories) * test_idx * (num_rot + 1))
print("total test samples", len(indices_test_database))
np.random.shuffle(indices_test_database)
# Open databases
train_db = lmdb.open(os.path.join(LMDB_path, 'train'), map_size=int(1e12),
map_async=True, writemap=True, meminit=False)
test_db = lmdb.open(os.path.join(LMDB_path, 'test'), map_size=int(1e12),
map_async=True, writemap=True, meminit=False)
last = time.time()
# Iterate over the category LMDBs
curr_train_idx, curr_test_idx = 0, 0
for idx, categ in enumerate(categories):
categ_db = lmdb.open(os.path.join(LMDB_path, categ), readonly=True)
with categ_db.begin() as categ_txn:
print("Writing {} samples to database".format(categ))
np.random.shuffle(indices_categ)
# Populating training LMDB
with train_db.begin(write=True) as in_txn_train:
for i in range(train_idx):
if i % 100000 == 0:
elapsed = time.time() - last
last = time.time()
print(
"Wrote {} training samples to database in {} "
"seconds".format(
i * (num_rot + 1),
elapsed))
in_idx = indices_categ[i]
in_key = DB_KEY_FORMAT.format(in_idx)
in_item = categ_txn.get(in_key)
out_key = DB_KEY_FORMAT.format(indices_train_database[i * (
num_rot + 1) + curr_train_idx])
in_txn_train.put(out_key, in_item)
# Rotate images by 90 degrees
datum = caffe.proto.caffe_pb2.Datum()
datum.ParseFromString(in_item)
assert datum.channels == 1, "The algorithm currently only " \
"works for 1-channel images"
flat_x = np.fromstring(datum.data, dtype=np.uint8)
x = flat_x.reshape(datum.height, datum.width)
y = datum.label
for rotation_idx in range(num_rot):
x = np.rot90(x)
out_image = np.reshape(x, (
datum.channels, datum.height, datum.width))
im_dat = caffe.io.array_to_datum(
out_image.astype('uint8'),
label=int(y))
out_key = DB_KEY_FORMAT.format(indices_train_database[
i * (
num_rot + 1) +
curr_train_idx
+ rotation_idx + 1])
in_txn_train.put(out_key, im_dat.SerializeToString())
curr_train_idx += train_idx * (num_rot + 1)
with test_db.begin(write=True) as in_txn_test:
for i in range(test_idx):
if i % 100000 == 0:
print("Wrote {} testing samples to database".format(
i * (num_rot + 1)))
in_idx = indices_categ[train_idx + i]
in_key = DB_KEY_FORMAT.format(in_idx)
in_item = categ_txn.get(in_key)
out_key = DB_KEY_FORMAT.format(indices_test_database[i * (
num_rot + 1) + curr_test_idx])
in_txn_test.put(out_key, in_item)
datum = caffe.proto.caffe_pb2.Datum()
datum.ParseFromString(in_item)
assert datum.channels == 1, "The algorithm currently only " \
"works for 1-channel images"
flat_x = np.fromstring(datum.data, dtype=np.uint8)
x = flat_x.reshape(datum.height, datum.width)
y = datum.label
for rotation_idx in range(num_rot):
x = np.rot90(x)
out_image = np.reshape(x, (
datum.channels, datum.height, datum.width))
im_dat = caffe.io.array_to_datum(
out_image.astype('uint8'),
label=int(y))
out_key = DB_KEY_FORMAT.format(indices_test_database[
i * (
num_rot + 1) +
curr_test_idx +
rotation_idx + 1])
in_txn_test.put(out_key, im_dat.SerializeToString())
curr_test_idx += test_idx * (num_rot + 1)
print('Wrote so far: {} train, {} test.\n'.format(curr_train_idx,
curr_test_idx))
categ_db.close()
test_db.close()
train_db.close()
if __name__ == '__main__':
parser = argparse.ArgumentParser(description='Turn a list of movies into\
an LMDB.')
parser.add_argument('--seed', default=42, type=int, help='Initialize the\
random seed of the run (for reproducibility).')
parser.add_argument('--workfile', default='workfile_train.txt',
help='File which is a list of movie files\
and labels to process,\
one per line, separated by four spaces')
parser.add_argument('--categories', default=['paper', 'scissors', 'rock',
'background'],
help='List of categories used for classification')
parser.add_argument('--LMDB_path', default='./lmdb_train/',
help='Where to write out the LMDB dataset.')
parser.add_argument('--avi_dir', default='./recordings',
help='Where to look for .avi files to add to the LMDB')
parser.add_argument('--working_dir', default='.',
help='Where to create the workfile used for creating '
'the LMDB')
parser.add_argument('--labels_dir', default='labels_train',
help='Where to create the labels files')
parser.add_argument('--train_test_split', default=0.8, type=float,
help='Where to split the data (not shuffled).')
parser.add_argument('--num_rotations', default=3, type=int,
help='How many 90 degree rotations to perform for '
'each image')
parser.add_argument('--gray', default=True,
help='If the input data is grayscale, the output' +
' LMDB images will have only one channel. '
'Otherwise' +
' it will have 3 channels.')
args = parser.parse_args()
# Set seed
np.random.seed(args.seed)
# Make the output directory
if not os.path.exists(args.LMDB_path):
os.makedirs(args.LMDB_path)
# Make the workfile used to create the LMDBs
create_workfile(args.avi_dir, args.working_dir, args.workfile,
args.labels_dir)
# Create the LMDBs
start_time = time.time()
curr_idx = write_categ_lmdb(args.workfile, args.categories,
args.LMDB_path, args.gray)
print("Number of samples for each category:{}".format(curr_idx))
write_train_test_lmdb(args.categories, args.LMDB_path,
args.train_test_split, args.num_rotations)
print('Finished in {}s.'.format(time.time() - start_time))